3Com 10014299 manual Typical Ethernet Interface Configuration Example, Troubleshooting

114CHAPTER 9: CONFIGURING LAN INTERFACE

Typical Ethernet

Interface

Configuration

Example

I. Networking Requirement

As shown below, the Ethernet interfaces of Routers A is connected to IP networks 192.168.0.0. The computer in LAN connects to the Internet through Router A. Set the MTU of Ethernet interface to 1492 bytes, and set the frame format to Ethernet_II.

II. Network Diagram

Figure 45 Networking diagram of Ethernet configuration example

LAN	Interface Address
	192.168.0.1
	E0	Internet
Network Address
192.168.0.0	Router A

III. Configuration Procedure

1 Specify the IP address as 192.168.0.1 and the mask as 255.255.255.0.

	[Router]interface ethernet 0
	[Router-Ethernet0]ip address 192.168.0.1 255.255.255.0
	2 Set MTU of the interface to 1492 bytes and frame format to Ethernet_II.
	[Router-Ethernet0]mtu 1492
	[Router-Ethernet0]send-frame-type ethernet_ii
Troubleshooting	The following test methods can be used to check faulty Ethernet interface is
	faulty:
	■ Ping the Ethernet interface from the host located in the same LAN as the router
	to observe whether the returned messages are correct.
	■ View the statistic information of two ends of the connection (such as the router
	and switch) to observe whether the statistic number of the received error
	frames increases quickly.
	If either test fails to pass, it indicates that the Ethernet interface of the router or
	the connected Ethernet is abnormal.
	After confirming the fault, proceed as follows:

1View whether the LAN connection between the host and router is correct.

If the Ethernet is connected with HUB or LAN Switch, please check the status of relevant link indicators on HUB or LAN Switch. If the indicators are on, it means that the Ethernet interfaces of the host and router and the network cable are physically correct. Otherwise, please replace such faulty physical equipment as the network adapter, network cable, router or relevant interface module.

When the Ethernet is connected with unshielded twisted pair and at least one of the connected parties supports 100BASE-TX, rate matching must be taken into consideration. If the working rates of two parties do not match, i.e. one works in 100 Mbps mode while the other works in 10 Mbps mode, then the fault is that